Blast furnace cooling system

ABSTRACT

A blast furnace cooling system employing staves cooling system, and providing projection which interposed replaceable between staves arranged upper and lower direction of the furnace.

United States Patent 1 678,743 7/l90l Kennedy 266/32 UNITED STATESPATENTS Sec Feb. 26, 1974 I5 BLAST FURNACE COOLING SYSTEM 744,31911/1903 Farrell 1, 319m:

790,269 5/1905 Baker v 200/12 [75] Inventor: Yoshio Seo, Yokohama, Japan897,016 8/1908 Robens h p 206/32 [73] Assignee: lshikawajima HarimaJukogyo g 1 A oron r Kabush'k' Tokyo-t0 a n 3,586,304 6/1971 Greaves266/32 [22] Filed: June 25, 1971 v [21] Appl. No.: 156,918 PrimaryExaminer-Gerald A. Dost Attorney, Agent, or FirmAlbert C. .Nolte, Jr.;Ed- 1301 Foreign Application Priority Data' ward Hunter; 0 m r July 4,1970 Japan 45-58442 52 11.5. C1. 266/32 [571 ABSTRACT [2g] 626lg27g2 Ablast furnace Cooling System p y g Stavcs COOL 1 1e 0 earc mg system,and providing projection which interposed Referen-ces Cited replaceablebetween staves arranged upper and lower direction of the furnace.

PATENTEDFEB26 m4 3.794.307

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PATENTEDFEBZB 1914 PATENTEDFB26 1974 SHEET U 0F 5 FIG. 6

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ATTORNEYS PATENTED FEB 2 6 H374 SHEEI 5 BF 5 FIG/l INVENTOR vosmo SEO BY77% ATTORNEYS a defect that the bricks are-locally cooled only aroundthe cooling plates and the bricks not cooled are easily subjected tocorrosion so thatthe uniform cooling effect is not attained.

To overcome this defect, there has been proposed a cooling systememploying staves which can cool-the blast furnace uniformly. But in thisconventional stave cooling system the bricks-are easily to be fallen offand the staves are also easily to be damaged.

To overcome the defects of the cooling system employing the staves,there has been proposed to form a when the inner surface of the blastfurnace is flat and the bricks are fallen off from the blast furnacewall, the

staves are subjected to high temperature furnace gases.

projection intergrally with each stave to extend in-' wardly. However,these projections are also easily damaged so that the staves have thesame shape as that of the conventional staves. As a consequence, thestaves do not have asufficient durability, and the life of the blastfurnace is accordingly lowered.

The present invention was made toeliminate the defects encountered inthe prior art blast furnace cooling systems, and is characterized inthat a number of staves are interposed-between the furnace bricks andthe steel shell; and replaceable members are inserted from the exteriorof the blast furnace into appropriate stave cooling portions so as to'extend inward beyond the inner surface of the furnace.

The present invention willv become more apparent from the followingdescription of the preferred embodiment thereof taken in conjunctionwith the accompanying drawings. i

FIGS. 1 to 3 are explanatory views illustrating the conventional blastfurnace employing the conventional staves for cooling the furnace;

FIG. 4 is a schematic side view partly in section of a blast furnaceemploying the cooling system in accord with the present invention; I

. FIG. 5 is an enlarged sectional view thereof illustrating the furancewall thereof;

FIG. 6 is a view illustrating the development of the blast furnaceemploying the cooling system in accord with the present inventionj FIG.7 is a fragmentary enlarged sectional view illustrating anotherembodiment of the present invention;

FIG. 10 is a view looking in the direction indicated by the arrow B ofFIG. 9; and

FIG. 11 is a view similar to FIGS. 8 and 10 illustrating a furtherembodiment of the present invention.

In the conventional stave cooling system as shown in FIGS. 1 3, a stavea having cooling tubes b cast as inserts and having flat surfaces isinterposed between the bricks c and a steel shell (1. This stave coolingsystem has an advantage that all of the bricks may be uni-- formlycooled, but the bricks c tend to fall off because of the furnaceoperation methods and the conditions within the blast furnaces. As shownin FIGS. 1 3,

That is, when the bricks are fallen off from the furnace wall, the hightemperature gases tend to pass between the staves and the charge ratherthan through the iron ores and coke, so that the staves are overheated.As a consequence they are damaged under the thermal shocks, thermalfatigues, the crystal growth of the material of the staves and the like.Since the replacement of the staves damaged is impossible, othersuitable cooling systems must be employed, so that the blast furnacesmust remain idle for a longtime, thus resulting in the poorproductivity.

In a preferred embodiment of the present cooling system as shown FIGS. 46, a great number of staves 1 enclosing cooling water tubes 4 areinterposed cylindrically between the bricks 2 and'a steel shell 3 of ablast furnace, and the feed and. discharge pipes are connected throughthe steel shell 3 to the cooling tubes 4 in the staves 1. A metal plate5 is inserted between the adjacent upper and lower edges of the staves 1as shown in FIG. 5 or between respective upper and lower staves, in sucha manner that the inner end of the metal plate 5 may reach the interiorof the bricks 2. The other end is securely fixed to the steel shell 3,anda cooling plate 6 having substantially same length as that of themetal plate 5-is placed parallelly over the plate 5 so that both of themetal plate 5 and the bricks 2 may be cooled by the cooling plate 6. Thelength of the cooling plate 6 may be arbitrarily selected. as needsdemand.

The'outer end of each cooling plates 6 is scalable fixed bricks 2 may beprevented from falling off from the fur-.

nace wall. Even when the bricks 2 immediately below the plate 5 shouldfall off from the furnace wall, the upward blow of hot gases between thestaves 1 and the charge may be prevented.

When the cooling plates 6 are damaged, by heat they may be moved out ofthe steel shell 3-and the new cooling plates 6 may be placed inposition, whereby the damage to the metal plates 5 may be minimized.

Another embodiment of the present invention is illustrated in FIGS. 7and 8. The cooling plate 6 is removably fixed to the undersurface of themetal plate 5 to cool both of the bricks 2 and the metal plate-5.

FIGS. 9 and 10 illustrate a still another embodiment of the presentinvention, inwhich the cooling plates 6 are placed on both of the upperand under surfaces of the steel plate 5.

.In the embodiments discussed above with reference to FIGS. 4 10, theportion'of the metal plates 5 between the heating plates 6 are notsufficiently cooled, so that the staves 1 on the side of the coolingplates 6 are modified as illustrated in FIGS. 6, 8 and 10 tosufficiently cool the metal plates 5. When the width of the stave l isrelatively greater-and the cooling plate 6 is placed inside the stave 1,both of the sides of the stave 1 are modified as illustrated in FIG. 11so that the metal plate 5 may be sufficiently cooled.

in the embodiments disclosed above, the metal plates which are insertedbetween the staves l have been described as being fixed to the steelshell 3 and the cooling plates 6 are disposed along the metal plates 5to cool it and the bricks 2. However, the following variations andmodifications are possible within the scope of the present invention.First of all, the metal plate 5 made of steel plate may be removablyinserted. In this case, no cooling plate 6 is used.rAlternatively, onlythe cooling plates 6 having a sufficient strength to support the bricks2 may be used without use of the metal plates 5. In addition, both ofthe'metal plates 5 and the cooling plates 6 may be removably disposedwithin each stave 1 instead of being interposed between the staves l.

As described hereinabove, the members (the metal plates 5 and thecooling plates 6) of a blast furnace cooling system are removablydisposed between the staves or within the staves which in turn areinterposed between the furnace bricks and the steel shell. Therefore,the bricks may be prevented from falling off from the furnace wall, andthe upward blow of the high temperature gases between the furnace wallor bricks and the charge may be prevented even when the bricks aredamaged,'so that the service life of the staves may become longer.Furthermore the members (the metal plates 5 and the cooling plates 6)may be immediately replaced with new ones when they are damaged, so thatthe service life ofthe staves may be increased. Therefore theproductivity may be much improved with the conventional cooling systems.

What is claimed is:

2. A blast furnace as claimed in claim 1 wherein acooling plate isdisposed between the metal plate and the row of staves below that metalplate.

3. A blast furnace comprising a steel shell, a refractory brick lining,horizontal rows of cooling staves between the lining and shell, acooling plate disposed between adjacent rows of staves and a metal platedisposed between the cooling plate and the row of staves above thecooling plate, said cooling plate and metal plate extending inwardly ofthe staves within the lining to support the bricks on the upper row ofstaves, said cooling plates being removably supported on the shell.

4. A blast furnace as claimed in claim lwhe reln said metal plateextends inwardly into said refractory brick lining at least to the sameextent as said cooling plate.

I 5. A blast furnace as claimed in claim 3 wherein said metal plateextends inwardly into said refractory brick lining at least to the sameextent as said cooling plate.

1. A blast furnace comprising a steel shell, a refractory brick lining,horizontal rows of cooling staves between the lining and shell, acooling plate disposed between adjacent rows of staves and a metal platedisposed between the cooling plate and the row of staves below thecooling plate, said cooling plate and metal plate extending inwardly ofthe staves within the lining to support the bricks on the upper row ofstaves, said cooling plates being removably supported on the shell.
 2. Ablast furnace as claimed in claim 1 wherein a cooling plate is disposedbetween the metal plate and the row of staves below that metal plate. 3.A blast furnace comprising a steel shell, a refractory brick lining,horizontal rows of cooling staves between the lining and shell, acooling plate disposed between adjacent rows of staves and a metal platedisposed between the cooling plate and the row of staves above thecooling plate, said cooling plate and metal plate extending inwardly ofthe staves within the lining to support the bricks on the upper row ofstaves, said cooling plates being removably supported on the shell.
 4. Ablast furnace as claimed in claim 1 wherein said metal plate extendsinwardly into said refractory brick lining at least to the same extentas said cooling plate.
 5. A blast furnace as claimed in claim 3 whereinsaid metal plate extends inwardly into said refractory brick lining atleast to the same extent as said cooling plate.